MPC564EVB Freescale Semiconductor, MPC564EVB Datasheet - Page 355

• Manufacturer Part Number: MPC564EVB
• Description: KIT EVAL FOR MPC561/562/563/564
• Manufacturer: Freescale Semiconductor
• Type: Microcontrollerr

Specifications of MPC564EVB

• Contents: Module Board, Installation Guide, Power Supply, Cable, Software and more
• Processor To Be Evaluated: MPC56x
• Data Bus Width: 32 bit
• Interface Type: RS-232, Ethernet
• For Use With/related Products: MPC561, 562, 563, 564
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

1. For an illustration of device connections on the data bus, see
9.5.3
Pre-discharge mode is provided for applications that use 3.3-V/5-V external memories while the
MPC561/MPC563 data bus pads are optimized to 2.6-V memories, and cannot tolerate more than 3.1 V.
When connecting 3.3-V devices to the E-bus, and performing read and write operations, this mode should
be invoked in order to avoid long term reliability issues of the data pads.
When the PDMCR2[PREDIS_EN] bit is set, the MPC561/MPC563 will discharge the bus during the
address phase of any write cycle prior to the data phase. The data bus will be discharged from up to 5 V to
a level which is suitable to the low voltage drivers. In most cases, the ORx[EHTR] bit of the relevant
memory bank, should be set along with the PREDIS_EN bit in order to reserve sufficient time for the
Freescale Semiconductor
CLKOUT
BR
BG
BB
ADDR[0:1]
RD/WR
TSIZ[0:1]
BURST, BDIP
TS
STS
Data
TA
1
Data Bus Pre-Discharge Mode
Figure 9-10. Single Beat 32-Bit Data Write Cycle Timing — 16-Bit Port Size
MPC561/MPC563 Reference Manual, Rev. 1.2
ADDR
00
ABCDEFGH
Figure
9-23.
10
ADDR + 2
EFGHEFGH
External Bus Interface
9-15